HIGH AND LOW SPEED DAMP­ING

Motorcycle News (UK) - - This Week -

Since the 2006 Yamaha YZF-R6 in­tro­duced the mo­tor­cy­cle world to high and low speed damp­ing, there has been a fair de­gree of con­fu­sion over what it ac­tu­ally is. Tech­ni­cally, it is bet­ter call­ing it ‘ fast and slow’ damp­ing rather than ‘high and low speed’ and is best thought of as the speed the oil is mov­ing around the sus­pen­sion sys­tem. High speed damp­ing refers to a sud­den and fast force be­ing ap­plied to the sus­pen­sion such as when you hit a pot hole while low speed is a more pro­gres­sive and smooth move­ment of the sus­pen­sion. Within a sus­pen­sion sys­tem the damp­ing is con­trolled via oil flow through small tubes and also shims on the pis­ton. Low speed damp­ing is ad­justed via a nee­dle in the tube vary­ing the oil’s flow while high speed is al­tered via ei­ther pres­sure on a spring on the top of the shim stack (it is the high-speed forces open­ing th­ese shims very quickly that you are try­ing to con­trol) or a sep­a­rate high speed shim stack sys­tem with its own bleed valve.

Swedish knobs on Öh­lins TTX36

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